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Last Updated: Friday, 20 October 2006, 08:16 GMT 09:16 UK
Sonic sirens target bad behaviour
Teenagers generic
The sirens emit a high-pitched noise which is "extremely annoying"
Sirens which can only be heard by people under 25 will be installed in parts of Grimsby in a bid to stamp out anti-social behaviour.

Areas earmarked for the high tech Mosquito sirens include parts of Immingham and the Nunsthorpe estate.

The sirens emit a high pitched ultra sonic blast and will be used to disperse groups of youths who gather to cause disturbances.

The devices have already been used in parts of Hull and Lancashire.

North East Lincolnshire Council said it was a temporary measure to move on youths causing trouble in an area, while work was carried out to find a more permanent solution.

'No complaints'

The mobile devices, which cost 500 each, will initially be fitted to buildings, but will be moved to a number of locations after consultation with local businesses and residents.

The siren, which the council says is "extremely annoying" for those who can hear it, relies on the effects of age-related hearing loss.

The authority said research had shown the Mosquito could be clearly heard by the under 20s, while those over 25 struggled to hear it at all.

Julie Ann Taylor, community safety and development manager for the council, said: "The Mosquito devices are particularly intended to affect the ears of those under the age of 25 and have proven effective when used in other areas.

"While some people over 25 have stated they have heard a noise when Mosquito's have been used, no complaints have ever been recorded."

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